Prediction of interfacial tensile bond strength in 3D printed concrete based on a closed-form fracture model

Lan, Tian; Yang, Shizhong; Wang, Mingxin; Xu, Mingqi; Cheng, Shidong; Chen, Zhengyuan

doi:10.1016/j.jobe.2023.106411

Cited by 4 publications

(3 citation statements)

References 45 publications

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“…Buildings 2023, 13, x FOR PEER REVIEW 11 of 13 times more than the expected relationship for conventional concrete (12%) [1]. The difference was caused by higher cement content, smaller aggregate size [33], and the use of PP fibres, possibly also due to the orientation of the fibres [21].…”

Section: Splitting Tensile Strengthmentioning

confidence: 89%

The Effect of Printing Direction on the Strength Characteristics of a 3D Printed Concrete Wall Section

Põldaru,

Tammkõrv,

Tuisk

et al. 2023

Buildings

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Digital construction is expected to reduce the high volume of waste and the labour shortage in the construction sector. The properties of hardened concrete used in 3D printing depend on numerous parameters within the manufacturing process. This study collected data using 208 specimens to measure the effect of the loading direction relative to the printing direction on the strength characteristics of printed concrete. The compressive strength was not significantly affected by the directions, but showed a 30% reduction from mould-casted strength due to lesser amount of compaction in the printing process. Flexural tensile strength showed a 14% reduction in one direction, possibly caused by heterogeneity due to the use of extrusion head with a 35% smaller diameter than the width of the layer. Splitting tensile strength was 14% lower when split between the printed layers. Splitting tensile strength is possibly 5% higher when PP fibres are oriented favourably.

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Section: Splitting Tensile Strengthmentioning

confidence: 89%

The Effect of Printing Direction on the Strength Characteristics of a 3D Printed Concrete Wall Section

Põldaru,

Tammkõrv,

Tuisk

et al. 2023

Buildings

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“…In previous studies, it has been reported that interfacial adhesion strength affects the anisotropy of printed objects [8,13]. The 3D-printed objects show higher strength in the extrusion direction than in the perpendicular direction [12,14].…”

Section: Introductionmentioning

confidence: 93%

“…It triggers two main challenges for printed objects. One of the challenges is weak interfacial adhesion strength between layers [8][9][10][11]. The other is the anisotropic mechanical property of the 3D-printed object [8,9,12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Aggregate Distribution Heterogeneity in 3D Printed Concrete by Means of X-ray CT

Yoshihara,

Nakase,

Hashimoto

et al. 2024

Buildings

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The mechanical performance of a printed object in 3D concrete printing is influenced by the interfacial bonding strength between the deposited filaments. Hence, the physical properties of the layer interface and the influential factors have been studied. This study aims to clarify the mechanism of aggregate distribution heterogeneity as well as the influence of printing material extrusion speed on the heterogeneity inside the filament. A laboratory-scale material extruder is developed and used in this study. The aggregate distribution is evaluated in a quantitative manner with the cross-sectional image obtained by X-ray computed tomography. The images were taken in the deposited filament and the material extrusion nozzle for printing. Results show that large aggregate moves from the outside of the printing nozzle toward the center with increasing extrusion speed from 1.8 to 7.1 mm/s. As extrusion speed increases, it is inferred that a lubrication layer forms on the inner surface of the nozzle, causing the transition of material extrusion behavior from laminate flow to plug flow. Thus, the aggregate distribution appears differently inside the filament. This finding indicates that the magnitude of friction against the nozzle wall alters the die swell during discharge as well as the aggregate distribution before and after extrusion.

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3D printing concrete structures: State of the art, challenges, and opportunities

Liu,

Zhang,

Zhang

et al. 2023

Construction and Building Materials

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Prediction of interfacial tensile bond strength in 3D printed concrete based on a closed-form fracture model

Cited by 4 publications

References 45 publications

The Effect of Printing Direction on the Strength Characteristics of a 3D Printed Concrete Wall Section

The Effect of Printing Direction on the Strength Characteristics of a 3D Printed Concrete Wall Section

Evaluation of Aggregate Distribution Heterogeneity in 3D Printed Concrete by Means of X-ray CT

3D printing concrete structures: State of the art, challenges, and opportunities

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